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diff --git a/3515/CH4/EX4.4/Ex_4_4.sce b/3515/CH4/EX4.4/Ex_4_4.sce
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+// Exa 4.4
+format('v',7);
+clc;
+clear;
+close;
+// Given data
+format('v',11)
+V_A= 20;// in V
+R_D= 5;// in kΩ
+R_D= R_D*10^3;// in Ω
+I= 0.8;// in mA
+I=I*10^-3;// in A
+i_D= I/2;// in A
+unCox= 0.2;// mA/V^2
+unCox= unCox*10^-3;// in A/V^2
+WbyL= 100;
+// Formula i_D= 1/2*unCox*WbyL*V_OV^2
+V_OV= sqrt(2*i_D/(unCox*WbyL));// in V
+disp(V_OV,"The value of V_OV in volts is : ")
+gm= I/V_OV;// in A/V;
+disp(gm*10^3,"The value of gm in mA/V is : ")
+r_o= V_A/i_D;// in Ω
+disp(r_o*10^-3,"The value of r_o in kΩ is : ")
+// Ad= v_o/v_id = gm*(R_D || r_o)
+Ad= gm*(R_D*r_o/(R_D+r_o)) ;// in V/V
+disp(Ad,"Differential gain in V/V is : ")
+
+